CN1451957A - Sample for temp. calibration of thermogravimeter and preparing method thereof - Google Patents
Sample for temp. calibration of thermogravimeter and preparing method thereof Download PDFInfo
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- CN1451957A CN1451957A CN 03126606 CN03126606A CN1451957A CN 1451957 A CN1451957 A CN 1451957A CN 03126606 CN03126606 CN 03126606 CN 03126606 A CN03126606 A CN 03126606A CN 1451957 A CN1451957 A CN 1451957A
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- standard specimen
- thermogravimetric analyzer
- temperature calibration
- magnetic
- sample
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- 238000000034 method Methods 0.000 title claims description 15
- 239000011224 oxide ceramic Substances 0.000 claims abstract description 3
- 230000005291 magnetic effect Effects 0.000 claims description 27
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 12
- 239000000843 powder Substances 0.000 claims description 12
- 238000005303 weighing Methods 0.000 claims description 10
- 238000005245 sintering Methods 0.000 claims description 8
- 238000002360 preparation method Methods 0.000 claims description 7
- 239000000919 ceramic Substances 0.000 claims description 4
- 238000013019 agitation Methods 0.000 claims description 3
- 239000013078 crystal Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 229910001404 rare earth metal oxide Inorganic materials 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 2
- 238000003980 solgel method Methods 0.000 abstract description 2
- UCNNJGDEJXIUCC-UHFFFAOYSA-L hydroxy(oxo)iron;iron Chemical compound [Fe].O[Fe]=O.O[Fe]=O UCNNJGDEJXIUCC-UHFFFAOYSA-L 0.000 abstract 1
- 229910052574 oxide ceramic Inorganic materials 0.000 abstract 1
- 239000002994 raw material Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 230000008859 change Effects 0.000 description 7
- 238000002411 thermogravimetry Methods 0.000 description 7
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 238000012795 verification Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 3
- 230000005477 standard model Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 229910002204 La0.8Sr0.2MnO3 Inorganic materials 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910001004 magnetic alloy Inorganic materials 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- QLOKJRIVRGCVIM-UHFFFAOYSA-N 1-[(4-methylsulfanylphenyl)methyl]piperazine Chemical compound C1=CC(SC)=CC=C1CN1CCNCC1 QLOKJRIVRGCVIM-UHFFFAOYSA-N 0.000 description 1
- 229910002182 La0.7Sr0.3MnO3 Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 235000010333 potassium nitrate Nutrition 0.000 description 1
- 239000004323 potassium nitrate Substances 0.000 description 1
- 239000012925 reference material Substances 0.000 description 1
- 238000002076 thermal analysis method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
A sample for the temp calibration of thermogravimetric analyzer is prepared by sol-gel method, in which the La-series RE, Mn, oxide is used as raw materials to prepare magnetic oxide ceramic. Said product has two samples, whose curie points are 29 deg.C and 90.4 deg.C respectively. Its advantages are high precision and resistance to corrosion and moisture, and low cost.
Description
Technical field
The present invention relates to a kind of standard specimen that is used for the thermogravimetric analyzer temperature calibration and preparation method thereof, specifically, relate to the standard specimen product that utilizes sol-gel process to prepare the demarcation temperature that thermogravimetric analyzer uses, belong to the standard substance field.
Background technology
Thermogravimetric analyzer is the most frequently used thermal-analysis instrumentation, and its quantitative property is strong, can be widely used in fields such as physics, chemistry, material, we can say, as long as material is when being heated, the variation of weight takes place, and all can study its change procedure with thermogravimetry (TG).Using thermogravimetric analysis (TG) when instrument is tested, the correction of temperature is crucial, the verification temperature has following three kinds of methods at present: the one, adopt to indicate the standard substance that temperature has the weightless point of reproduction again, it is not only relevant with temperature that yet product is overflowed, also relevant with heating rate, this is the limitation of this method.The 2nd, adopt to have and can reproduce or the material of reversible inversion temperature, the characteristics of this method are irrelevant with atmosphere, it requires, and thermopair contacts with sample or supporter in checking procedure, the material that can use as standard is that those have the material that the solid or solid liquid of solid changes, as potassium nitrate, potassium chromate and tin etc.The 3rd, adopt to have fixed temperature and issue magnetisation variation and can be the material of this reacting condition on the TG curve.This class material is magnetic alloy or metal normally, as nickel, iron, etc.Be placed on magnetic material in the supporter and make it to be in the magnetic field, when temperature rises when reaching the Curie point of material in the supporter, magnetic force disappears, and thermobalance indicates the apparent loss in weight with the magnetic force equivalence.
Desirable standard ferromagnetic material should have following character:
1) the magnetic transformation process must that is to say just to become magnetic to change in very little temperature range rapidly.Can obtain steep TG curve like this.The interval big or small dTc of general available magnetic sample transition temperature characterizes the definite precision of standard specimen to instrument temperature.The concrete practice is: does magnetic thermogravimetric curve differential curve, a peak value can occur at magnetic transition point, and the corresponding magnetic transition temperature variation of the halfwidth dTc at this peak interval, the more little precision of dTc is big more.
2) it is little to cause that magnetic changes needed externally-applied magnetic field.
3) the magnetic transformation temperature is not influenced by the chemical attribute of atmosphere should, should be irrelevant with atmosphere pressures.
4) the magnetic change procedure should be reversible so that sample can repetition test, up to temperature correction till the optimum value.
5) the magnetic change procedure should not be subjected to the influence of other reference material, to guarantee testing several samples simultaneously.
6) the standard model amount can be observed change procedure significantly in the milligram level.
The now domestic and international used standard specimen of thermogravimetric analyzer, mainly provide by two external big instrument companies, the one, Germany anti-executing (NETZSCH) company, its standard specimen that provides is feeromagnetic metal or alloy, the disk shape, to between the 200mg, the scale temperature is respectively 74 ℃, 160 ℃, 266 ℃, 358 ℃, 497 ℃, 770 ℃ to every tablet quality at 80mg, about 200 marks of each standard specimen price (closing 1200 yuan of Renminbi).Another is a U.S. PERKIN-ELMER company, and its standard specimen also is nickel, iron and other magnetic alloy, and it is thread or banded that standard specimen mostly is, and the verification temperature is respectively 163 ℃, 354 ℃, and 438 ℃, 596 ℃, 780 ℃, 1000 ℃.Metal or alloy standard specimen environmental requirement to external world is harsh, and apt to deteriorate in acid atmosphere or wet environment, sample retention is strict.The main following points of defective of Germany and U.S.'s standard specimen: the one, lack near the standard model of room temperature, the 2nd, the metal standard specimen is easy to corrosion under the environment of high humidity, and the 3rd, sample is a not acid-alkali-corrosive-resisting of metal, the 4th, precision is not very good.
Summary of the invention
The object of the present invention is to provide a kind of simple and effective standard specimen that is used for the thermogravimetric analyzer temperature calibration and preparation method thereof, standard specimen verification temperature is respectively near the room temperature and near 90 ℃, acid-alkali-corrosive-resisting, apparent thermogravimetric change (highly) amount greatly, and low price.
The present invention adopts the magnetic rare earth oxide ceramic with giant magnetoresistance effect to be ready for use on the standard specimen of thermogravimetric analyzer temperature calibration, and the percentage by weight of its component is respectively
La 42～48；
Sr 7～12；
Mn 22～25；
The main technique flow process of preparation standard specimen is as follows:
Take by weighing the La of doses by above-mentioned standard specimen component ratio
2O
3Be dissolved in HNO
3Get colourless transparent solution, take by weighing Mn (CH
3COO)
24H
2The water-soluble one-tenth colourless transparent solution of O takes by weighing Sr (CH
3COO)
2H
2O is dissolved in H
2O becomes colourless transparent solution, then above-mentioned three kinds of solution are mixed, add citric acid again in the mixed liquor and make peptizator, magnetic agitation 3 hours, keeping temperature of reaction is 60 ℃. then with the mixed liquor evaporate to dryness, get the loose powder of black, again powder was placed 1000 ℃ of sintering of muffle furnace 2 hours, obtain nanocrystalline powder; Above-mentioned nanometer crystal powder is pressed into disk by the standard specimen requirement,, promptly obtains being used for the ceramic standard specimen of thermogravimetric analyzer temperature calibration 1200 ℃ of sintering 5 hours.The Curie point that is prepared into standard specimen is at 29 ℃ and 90.4 ℃.
It is as follows that standard specimen is used for the concrete operations of thermogravimetric analyzer temperature calibration verification: at the thermogravimetric analyzer initial period, above-mentioned standard specimen is placed in the analyser thermobalance, add low-intensity magnetic field (intensity is 100 Gausses), heat up then, above-mentioned sample has apparent weight sudden change at Curie point, writes down instrument displays temperature this moment, compares with the Tc point of standard specimen itself, again instrument is carried out the temperature adjustment, till the standard temperature scope.The storage of standard specimen is that the product of making is contained in the plastic sample box, and the time spent is not put into exsiccator.
We compare with external standard specimen, and advantage exists: 1) fill up near domestic and international standard specimen blank of (29 ℃) room temperature.2) our standard specimen weight is less than 1/5th of German standard specimen, and apparent thermogravimetric changes and surpasses German product, and consumption few (more than 30 milligrams) is quick on the draw.3) temperature accuracy of our two samples is respectively 6.8 ℃ and 5 ℃, Germany be 19.1 ℃ and 7 ℃, our product precision is wanted high .4) our sample is ceramic sample, acid-alkali-corrosive-resisting, Germany and U.S.'s sample are metal or alloy, the fearness acid and alkali corrosion.4) adopt the oxide magnetic pottery to do standard specimen first, rather than magnetic metal or alloy.5) we prepare sample and adopt simple sol-gel technique, sample constituents is evenly adjustable, about 1200 ℃ of sintering temperatures, standard specimens such as Germany must be mixing with the metal congruent melting, about 2600 ℃ of sintering temperatures, our sample price is 500 yuan/kilogram, Germany's product price is 600,000/kilogram, and price is our 10,000 2000 times, in view of this, our standard specimen technology is easy, low price.
Description of drawings
Fig. 1 is the magnetic thermogravimetric curve of standard specimen of the present invention.
Fig. 2 is the magnetic thermogravimetric curve of the anti-company's standard specimen of speeding of Germany.
Among Fig. 1, we utilize magnetic rare earth oxide pottery with giant magnetoresistance effect to prepare the disk shape pottery of Curie point 29 ℃ and 90.4 ℃, sample shape is Φ 5 * 1mm quality for being respectively 33mg, 30mg, and the anti-weight of speeding company's standard specimen of Germany is our more than 5 times of sample.
Among Fig. 2, by the TG curve as can be seen, the dTc value of this standard specimen is respectively 19.1 ℃ and 7 ℃, and the dTc value of two samples that we are prepared is respectively 6.8 ℃ and 5 ℃, and as seen our precision will be higher than German product.Comparison diagram 1 and Fig. 2 as can be seen, the apparent thermogravimetric of our sample changes the sample of (highly) amount greater than German company, and the sample of unit mass be described, our standard specimen consumption is few, changes obvious.On the other hand, take a broad view of the standard specimen of anti-speed company and U.S. P-E company of Germany, lack near the standard model of room temperature, and we have near the standard specimen of room temperature, and we adopt the magnetic ceramics of acid-alkali-corrosive-resisting to substitute magnetic metal for the first time or alloy is made standard specimen.
Embodiment
With La
0.8Sr
0.2MnO
3Standard specimen is an example, and its weight percentages of components is
La 47.98；
Sr 7.57；
Mn 23.72；
O 20.73。
Its preparation method is: used chemical reagent mainly contains: La
2O
3, Sr (CH
3COO)
2H
2O, Mn (CH
3COO)
24H
2O, dense HNO
3, citric acid, by La: Sr: Mn=8: 2: 10 mol ratio takes by weighing above-claimed cpd.Key step is as follows: the La that takes by weighing doses
2O
3Be dissolved in an amount of HNO
3Get colourless transparent solution, take by weighing Mn (CH
3COO)
24H
2O is dissolved in suitable quantity of water and becomes colourless transparent solution, takes by weighing Sr (CH
3COO)
2H
2O is dissolved in H
2O becomes colourless transparent solution, then above-mentioned three kinds of solution are mixed, the citric acid that adds doses in the mixed liquor is made peptizator again, magnetic agitation 3 hours, keeping temperature of reaction is 60 ℃. then with the mixed liquor evaporate to dryness, get the loose powder of black. again powder is placed 1000 ℃ of sintering of muffle furnace 2 hours, and obtained nanocrystalline La
0.8Sr
0.2MnO
3Powder. above-mentioned nanometer crystal powder is pressed into φ 5 * 1mm disk and φ 10 * 1mm disk,, promptly obtains La 1200 ℃ of sintering 5 hours
0.8Sr
0.2MnO
3Pottery.
La
0.7Sr
0.3MnO
3The weight percentages of components of standard specimen is
La 42.94；
Sr 11.61；
Mn 24.26；
O 21.19。
Its preparation process is the same, and only its mol ratio is La: Sr: Mn=7: 3: 10.
Claims (4)
1, a kind of standard specimen that is used for the thermogravimetric analyzer temperature calibration is characterized in that adopting the magnetic rare earth oxide ceramic with giant magnetoresistance effect to be ready for use on the standard specimen of thermogravimetric analyzer temperature calibration, and the percentage by weight of its component is respectively
La 42～48；
Sr 7～12；
Mn 22～25；
O 20～22。
2, a kind of as the said standard specimen that is used for the thermogravimetric analyzer temperature calibration of claim 1, it is characterized in that the percentage by weight of the component of this standard specimen is respectively
La 47.98；
Sr 7.57；
Mn 23.72；
O 20.73。
3, a kind of as the said standard specimen that is used for the thermogravimetric analyzer temperature calibration of claim 1, it is characterized in that the percentage by weight of the component of this standard specimen is respectively
La 42.94；
Sr 11.61；
Mn 24.26；
O 21.19。
4, a kind of as the said preparation method who is used for the standard specimen of thermogravimetric analyzer temperature calibration of claim 1, it is characterized in that the main technique flow process is: the La that takes by weighing doses by the standard specimen component ratio
2O
3Be dissolved in HNO
3Get colourless transparent solution, take by weighing Mn (CH
3COO)
24H
2The water-soluble one-tenth colourless transparent solution of O takes by weighing Sr (CH
3COO)
2H
2O is dissolved in H
2O becomes colourless transparent solution, then above-mentioned three kinds of solution are mixed, add citric acid again in the mixed liquor and make peptizator, magnetic agitation 3 hours, keeping temperature of reaction is 60 ℃. then with the mixed liquor evaporate to dryness, get the loose powder of black, again powder was placed 1000 ℃ of sintering of muffle furnace 2 hours, obtain nanocrystalline powder; Above-mentioned nanometer crystal powder is pressed into disk by the standard specimen requirement,, promptly obtains being used for the ceramic standard specimen of thermogravimetric analyzer temperature calibration 1200 ℃ of sintering 5 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03126606 CN1198127C (en) | 2003-05-20 | 2003-05-20 | Sample for temp. calibration of thermogravimeter and preparing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03126606 CN1198127C (en) | 2003-05-20 | 2003-05-20 | Sample for temp. calibration of thermogravimeter and preparing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1451957A true CN1451957A (en) | 2003-10-29 |
| CN1198127C CN1198127C (en) | 2005-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03126606 Expired - Fee Related CN1198127C (en) | 2003-05-20 | 2003-05-20 | Sample for temp. calibration of thermogravimeter and preparing method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101531513B (en) * | 2009-04-16 | 2011-12-28 | 清华大学 | Intelligent heat radiative ceramic material and preparation method |
| CN104568209A (en) * | 2015-01-07 | 2015-04-29 | 大连理工大学 | Magnetic material curie temperature measuring method based on thermogravimetry changes |
| CN104568645A (en) * | 2015-01-13 | 2015-04-29 | 兰州大学 | Test method of Curie temperature of ferromagnetic material |
| CN111198202A (en) * | 2020-01-14 | 2020-05-26 | 广东省计量科学研究院（华南国家计量测试中心） | Preparation method and application of cobalt Curie point standard substance |
| CN111198201A (en) * | 2020-01-14 | 2020-05-26 | 广东省计量科学研究院（华南国家计量测试中心） | Preparation method and application of iron Curie point standard substance |
| CN111198200A (en) * | 2020-01-14 | 2020-05-26 | 广东省计量科学研究院（华南国家计量测试中心） | Nickel Curie point standard substance and preparation method thereof |
| CN111208167A (en) * | 2020-01-14 | 2020-05-29 | 广东省计量科学研究院（华南国家计量测试中心） | Preparation method and application of standard substance of Curie point of Aleamer alloy |
-
2003
- 2003-05-20 CN CN 03126606 patent/CN1198127C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101531513B (en) * | 2009-04-16 | 2011-12-28 | 清华大学 | Intelligent heat radiative ceramic material and preparation method |
| CN104568209A (en) * | 2015-01-07 | 2015-04-29 | 大连理工大学 | Magnetic material curie temperature measuring method based on thermogravimetry changes |
| CN104568209B (en) * | 2015-01-07 | 2017-02-22 | 大连理工大学 | Magnetic material curie temperature measuring method based on thermogravimetry changes |
| CN104568645A (en) * | 2015-01-13 | 2015-04-29 | 兰州大学 | Test method of Curie temperature of ferromagnetic material |
| CN111198202A (en) * | 2020-01-14 | 2020-05-26 | 广东省计量科学研究院（华南国家计量测试中心） | Preparation method and application of cobalt Curie point standard substance |
| CN111198201A (en) * | 2020-01-14 | 2020-05-26 | 广东省计量科学研究院（华南国家计量测试中心） | Preparation method and application of iron Curie point standard substance |
| CN111198200A (en) * | 2020-01-14 | 2020-05-26 | 广东省计量科学研究院（华南国家计量测试中心） | Nickel Curie point standard substance and preparation method thereof |
| CN111208167A (en) * | 2020-01-14 | 2020-05-29 | 广东省计量科学研究院（华南国家计量测试中心） | Preparation method and application of standard substance of Curie point of Aleamer alloy |
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| Publication number | Publication date |
|---|---|
| CN1198127C (en) | 2005-04-20 |
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